In a message dated 1/2/00 7:22:35 PM Central Standard Time, Par pp 807 writes: << The classical formula for capacitance is C = kA / d >> OOPS!!! First error of the new year. I forgot to include the permittivity of free space, e naught 8.85 x 10 ^ -12 Correct formula: C = e naught kA / d sorry, thanks Terry :-)) Cheers, Ralph Zekelman